Final answer:
A hydrogen bond is the type of bond that holds together neighboring subunits in a single strand of DNA. Hydrogen bonds are relatively weak compared to covalent bonds, but they play a crucial role in stabilizing the structure of DNA, as well as other biological molecules like proteins.
Step-by-step explanation:
A hydrogen bond is the type of bond that holds together neighboring subunits in a single strand of DNA.
Hydrogen bonds are formed between a hydrogen atom, which is covalently bonded to a small, highly electronegative atom like oxygen or nitrogen, and a lone pair of electrons on an atom in the neighboring molecule.
Hydrogen bonds are relatively weak compared to covalent bonds, but they play a crucial role in stabilizing the structure of DNA, as well as other biological molecules like proteins.